Thomas claeksok



.T. CLARKSON. PRESSURE; CONTROLLED VALVE. neucmdu'msn'szrn4, 191a.

Patented Feb. 8, 1921 scan:

CC4= JYE I H UNITED STATES THOMAS CLARKSON, 0F CHELMSFORD, ENGLAND.

PRESSURE-CONTROLLED VALVE.

Specification of Letters Patent.

Application filed September 4, 1918. Serial No. 252,621.

To all whom it may concern:

Be it known that I, THOMAS CLAnKsoN, a subject of the King of England, and residing at Chelmsford, Essex England, have invented certain new and useful Improvements in Pressure-Controlled Valves, of which the following is a specification.

This invention relates to pressure controlled valves more particularly valves for regulating the flow of steam or other fluid by variations in steam pressure and has for its object to construct a valve of this type which is more especially designed for use in the control of steam to a jet which is employed for inducing draft in a steam generator heated by solid fuel.

According to this invention the valve comprises a rod which can be rotated or oscil lated about its axis and also reciprocated,

one end of the rod constituting a valve while the other end is adapted to be acted on by steam pressure in opposition to a suitably disposed spring. The oscillating motion which is imparted to the rod or spindle is preferably slow and alternates through a predetermined angle and serves to keep the spindle free in the stuffing boxes through which it passes at either end so that it will be sensitive to the steam pressure which acts on one end. Thus the rod can be moved longitudinally with ease either to seat the valve or lift it off its seat.

The invention may be put into practice in various ways but the accompanying drawings illustrate by way of example a convenient constructed which may be adopted for the purpose of regulating the flow of steam to the jet of a blower or like device employed in conjunction with the furnace of a steam generator the pressure in which acts on the valve. In these drawings, Figure l is a side elevation of the i1-- proved pressure controlled valve.

Fig. 2 is a longitudinal sectional elevation on the line 2-2 of Fig. 1.

Fig. 3 is a transverse section on the line 3-3 of Fig. 1.

Like letters indicate like parts throughout the drawings.

The valve spindle A is formed as a rod which toward one end A is of somewhat larger diameter than the main portion of the rod. This part of larger diameter constitutes a plunger and lies in a cylinder B one end of which is in free communication through a passage B with the generator. The plunger A passes through a stufling box C of suitable construction. At its opposite end the spindle is coned to constitute a valve A which lies opposite to a seatlng D formed in the end of a pipe or passage D through which steam or air on occas1on can flow toward the end of the valve A into a chamber D in which the valve lies. A suitable outlet D for the steam or air is provided through the side wall of this chamber. The end of this chamber through which the spindle enters carries a stufling box E of convenient type.

The pressure cylinder B in which lies the plunger A is positioned opposite to the chamber D in which is the valve seat D and in the same axial line and the spindle A extends between these two parts. The cylinder B is flanged as at B and fixed by studs B between the ends of the arms F of a U -shaped frame while the valve chamber D is mounted oppositely in the part F of the frame which joins the arms F the spindle A thus lying between and parallel to tie frame arms or members. The casing constituting the valve chamber has a cylindrical external part D which is screwthreaded and engaged by nuts G G which lie as shown in Fig. 2 on either side of a hole F in the frame part F through which hole the valve casing passes. Thus it is possible to adjust the position of the valve seat D relatively to the valve A and pressure cylinder B in the axial direction of the spindle A. The valve chamber can be fixed after adjustment by locknuts mounted on the chamber.

At some intermediate point in the length of the U-shaped frame F there isformed an inwardly directed annular or other flange F which serves as an abutment for one end of a coiled spring H which lies around the valve spindle A. The other end of this spring bears against a disk J or washer which is carried on a boss A formed on the valve spindle conveniently at that place where the spindle is enlarged to form the plunger A. This washer J is thus carried adj acent to the end of the pressure cylinder B and the action of the spring H tends to lift the valve A oil its seat D and cause the plunger A to enter the cylinder B. The steam pressure acts in opposition to this spring H and tends to force the valve A on to its seat D.

Projecting from the above-mentioned boss Patented Feb. 8, 1921.

the generator to a jet which of such apressure A on the valve spindle is a lever arm K which 1s connected to suitable mechanism by means of which the spindle A can be oscillated or given a partial rotation to and fro,

the mechanism and connections to this lever arm being such as to permit thisoscillation to take place constantly without interfering with the movement of the spindle in the axial direction consequent on the steam or the spring H. In order to allow the necessary play between the washer J against which bears one end of the spring H and the spindle A the washer is conveniently coned internally and the part A of the boss A against which the washer lies is also coned or rounded as shown in Fig. 2. This permits the spring to adjust itself. As the are through which the spindle A is oscillated is preferably small the effect of this movement on the spring is inconsiderable as the spring will merely tend to slightly wind up and unwind. I

If desirable and for the purposes of assisting lubrication of the plunger the cylinder B may contain a small quantity of oil or may be filled wholly or partially with oil so arranged that the steam pressure can act through the oil on the plunger A.

A pressure controlled valve constructed as above described is more particularly designed for use in conjunction with a steam generator which is heated by solid fuel such as coke and mounted on a motor road vehicle. The steam is allowed to pass from is disposed in the flue and there serves as an ejector to draw air through the coke furnace and the products of combustion from the furnace to and through the generator. A similar arrangement maybe employed to force air into the furnace so as to control the passage of the products of combustionto the flue. In such a construction it is particularly desirable to have the furnace draft regulated in accordance with the demand on the generator and the pressure therein and by means controlled valve as herein described this can be effected. By movement of the valve chamber D in the direction of its axis as above described the actuation of the valve A? can be adjusted in accordance with the steam pressure and without adjustment of the spring H which acts on the valve.

What I claim as myinvention and desire to secure by Letters Patent is 1. In a pressure controlled valve the combination of a casing having therein a chamber with inlet and outlet passages and a the action of the member can be rotated, and a s valve seat formed at the inner end of the inlet passage, a cylinder to which steam under pressure can be admitted, a member one end of which is formed as a valve adapted to engage the seat in the chamber while the other end constitutes a piston which lies and can move in the cylinder so as to be acted on by the steam therein, stuffing boxes in the chamber and cylinder walls through which said member extends, a spring operative to more the member in opposition to the pressure of the steam in the cylinder, and means for rotating the member as set forth.

2. In a pressure controlled valve the com bination of a casing having therein a chamber with inlet and outlet passages and a valve seat formed at the inner end of the inlet passage, a cylinder to which steam under pressure can be admitted, a member one end of which is formed as a valve adapted to engage the seat in the chamber while the other end constitutes a piston which lies and can move in the cylinder so as to be acted on by the steam therein, stuffing bones in the chamber and cylinder walls through which said member extends, a lever mounted on the member and serving as means bv which ng operative tov move the member in opposition to the pressure of the steam in the c vlineer as set forth. r

3. In a pressure controlled valve the combination of a casing having therein a chamber and at one end thereof an inlet passage with a valve seat formed at the inner end of the passage and opposite thereto an opening through the wall of the casing provided 7 with a stuiiing box while an outlet passage leads'laterally from the chamber, a cylinder to one end of which steam under pressure can be admitted while the other end is'provided with a stufling box the cylinder being coaXially disposed in relation to the inlet passage and valve seat in the chamber, a rod-like member one end of which passes through the stuffing box into the chamber and is formed as a valve and adaptedto engage the seat inthe chamber while the other end which passes through the stufiing box into the cylinder constitutes a piston movable in the cylinder by the action thereon of the steam in thecylinder, a spring operative to move the member in opposition to the pressure of the stcam in the cylinder, and means for rotating the member as set forth.

In testimony whereof I have signed, my name to this specification.

THOMAS, .GLARKSON. 

